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If we're not going back to circular slip-ring connectors that allow rotation (like TRS or DC plugs,) then the step after the +-90-reversible USB-C is a triangular one. So you only need to rotate it +-30 if you got it wrong. Now I really want a triangular connector. Like in alien-tech movies.

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Let's go further and get a hexagonal one.

This is not so crazy - this was exactly the progression in screw drives. First came slotted screws (2-fold rotational symmetry), then Phillips/posidrive/Robertson (4-fold), and now Torx (6-fold). Going back to slotted now is actually irritating.

Of course the constraints and trade-offs are very different... still it would be a piece of cake to plug them in on the backside of a box with your eyes closed.

What's wrong with circular? There's no wrong way to plug it in.

Nothing to me, for the same reason you gave. I'd love to see them making a comeback.

My guess is they won't come back because modern connectors are so thin that if you made them equally narrow, they'd break/bend easily. (And yes, 3.5mm really is too thick to be a standard size, e.g. in wearables. The outer thickness of the USB-C socket is 3.3mm.)

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